The parade of longevity fads promising to add more years to average existence – from cold plunges and intermittent fasting to red-light therapy – can itself feel never-ending. But the glut of health buzzwords, along with the strength of the US$1.8-trillion global wellness market, demonstrates the obvious: people want to live a long time – but they also want to age well.

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According to the United Nations Population Division, the global life

Kristina Nguyen started to dip into skin care when she was 12, to deal with bad bouts of acne.

Home remedies led to experiments with products, and eventually to TikTok and YouTube, where Kristina shares skin-care routines, advice and reviews. Four years later, she has more than 615,000 and 26,000 followers on each platform respectively.

One of her most popular TikTok videos, with more than 13.9 million views, shows a dizzying array of beauty products laid out before her. It’s captioned: “This